void IEvictionPolicy.Execute(CacheBase cache, CacheRuntimeContext context, long evictSize) { ILogger NCacheLog = cache.Context.NCacheLog; if (NCacheLog.IsInfoEnabled) NCacheLog.Info("LocalCache.Evict()", "Cache Size: {0}" + cache.Count.ToString()); //if user has updated the values in configuration file then new values will be reloaded. _sleepInterval = Convert.ToInt32(ServiceConfiguration.EvictionBulkRemoveDelay); _removeThreshhold = Convert.ToInt32(ServiceConfiguration.EvictionBulkRemoveSize); DateTime startTime = DateTime.Now; IList selectedKeys = this.GetSelectedKeys(cache, (long)Math.Ceiling(evictSize * _ratio)); DateTime endTime = DateTime.Now; if (NCacheLog.IsInfoEnabled) NCacheLog.Info("LocalCache.Evict()", String.Format("Time Span for {0} Items: " + (endTime - startTime), selectedKeys.Count)); startTime = DateTime.Now; Cache rootCache = context.CacheRoot; ClusteredArrayList keysTobeRemoved = new ClusteredArrayList(); ClusteredArrayList dependentItems = new ClusteredArrayList(); IList removedItems = null; IEnumerator e = selectedKeys.GetEnumerator(); int removedThreshhold = _removeThreshhold/300; int remIteration = 0; while (e.MoveNext()) { object key = e.Current; if (key == null) continue; keysTobeRemoved.Add(key); if (keysTobeRemoved.Count % 300 == 0) { try { OperationContext priorityEvictionOperationContext = new OperationContext(); priorityEvictionOperationContext.Add(OperationContextFieldName.OperationType, OperationContextOperationType.CacheOperation); removedItems = cache.RemoveSync(keysTobeRemoved.ToArray(), ItemRemoveReason.Underused, false, priorityEvictionOperationContext) as ArrayList; context.PerfStatsColl.IncrementEvictPerSecStatsBy(keysTobeRemoved.Count); } catch (Exception ex) { NCacheLog.Error("PriorityEvictionPolicy.Execute", "an error occurred while removing items. Error " + ex.ToString()); } keysTobeRemoved.Clear(); if (removedItems != null && removedItems.Count > 0) { dependentItems.AddRange(removedItems); } remIteration++; if (remIteration >= removedThreshhold) { //put some delay so that user operations are not affected. System.Threading.Thread.Sleep(_sleepInterval*1000); remIteration = 0; } } } if (keysTobeRemoved.Count > 0) { try { OperationContext priorityEvictionOperationContext = new OperationContext(); priorityEvictionOperationContext.Add(OperationContextFieldName.OperationType, OperationContextOperationType.CacheOperation); removedItems = cache.RemoveSync(keysTobeRemoved.ToArray(), ItemRemoveReason.Underused, false, priorityEvictionOperationContext) as ArrayList; context.PerfStatsColl.IncrementEvictPerSecStatsBy(keysTobeRemoved.Count); if (removedItems != null && removedItems.Count > 0) { dependentItems.AddRange(removedItems); } } catch (Exception ex) { NCacheLog.Error("PriorityEvictionPolicy.Execute", "an error occurred while removing items. Error " + ex.ToString()); } } if (dependentItems.Count > 0) { ArrayList removableList = new ArrayList(); if (rootCache != null) { foreach (object depenentItme in dependentItems) { if (depenentItme == null) continue; removableList.Add(depenentItme); if (removableList.Count % 100 == 0) { try { OperationContext priorityEvictionOperationContext = new OperationContext(); priorityEvictionOperationContext.Add(OperationContextFieldName.OperationType, OperationContextOperationType.CacheOperation); rootCache.CascadedRemove(removableList, ItemRemoveReason.Underused, true, priorityEvictionOperationContext); context.PerfStatsColl.IncrementEvictPerSecStatsBy(removableList.Count); } catch (Exception exc) { NCacheLog.Error("PriorityEvictionPolicy.Execute", "an error occurred while removing dependent items. Error " + exc.ToString()); } removableList.Clear(); } } if (removableList.Count > 0) { try { OperationContext priorityEvictionOperationContext = new OperationContext(); priorityEvictionOperationContext.Add(OperationContextFieldName.OperationType, OperationContextOperationType.CacheOperation); rootCache.CascadedRemove(removableList, ItemRemoveReason.Underused, true, priorityEvictionOperationContext); context.PerfStatsColl.IncrementEvictPerSecStatsBy(removableList.Count); } catch (Exception exc) { NCacheLog.Error("PriorityEvictionPolicy.Execute", "an error occurred while removing dependent items. Error " + exc.ToString()); } removableList.Clear(); } } } return; }
/// <summary> /// Called by the scheduler to remove the items that has expired /// </summary> public bool Expire() { //indicates whether some items expired during this interval or not... bool expired = false; //muds: //if user has updated the file then the new values will be reloaded. _sleepInterval = Convert.ToInt32(ServiceConfiguration.ExpirationBulkRemoveDelay); _removeThreshhold = Convert.ToInt32(ServiceConfiguration.ExpirationBulkRemoveSize); CacheBase cacheInst = _context.CacheImpl; CacheBase cache = _context.CacheInternal; Cache rootCache = _context.CacheRoot; if (cache == null) throw new InvalidOperationException("No cache instance defined"); bool allowExpire = AllowClusteredExpiry; //in case of replication, only the coordinator/sub-coordinator is responsible to expire the items. if (!allowExpire) return false; ClusteredArrayList selectedKeys = new ClusteredArrayList(); int oldItemsCount = 0; HashVector oldeItems = null; try { StartLogging(); DateTime startTime = DateTime.Now; int currentTime = AppUtil.DiffSeconds(startTime); int cleanSize = (int)Math.Ceiling(cache.Count * _cleanRatio); //set the flag that we are going to expire the items. if (_cacheLastAccessLoggingIntervalPassed >= _cacheLastAccessLoggingInterval) { _cacheLastAccessLoggingInterval = CacheLastAccessLoggingInterval; _cacheLastAccessCountEnabled = IsCacheLastAccessCountEnabled; _cacheLastAccessCountLoggingEnabled = IsCacheLastAccessLoggingEnabled; _cacheLastAccessInterval = CacheLastAccessCountInterval; } else _cacheLastAccessLoggingIntervalPassed++; if (_cacheLastAccessCountEnabled && _cacheLastAccessCountLoggingEnabled) { if (_cacheLastAccessLoggingIntervalPassed >= _cacheLastAccessLoggingInterval) { _cacheLastAccessLoggingIntervalPassed = 0; oldeItems = new HashVector(); } } lock (_mainIndex.SyncRoot) { IDictionaryEnumerator em = _mainIndex.GetEnumerator(); if (em != null) { while (em.MoveNext()) { ExpirationHint hint = em.Value as ExpirationHint; if (hint != null && _cacheLastAccessCountEnabled && hint is IdleExpiration) { IdleExpiration slidingExpHint = hint as IdleExpiration; TimeSpan diff = AppUtil.GetDateTime(AppUtil.DiffSeconds(DateTime.Now)) - AppUtil.GetDateTime(slidingExpHint.LastAccessTime); if (diff.TotalMinutes >= _cacheLastAccessInterval) { oldItemsCount++; if (oldeItems != null) { oldeItems.Add(em.Key, null); } } } if (hint == null || hint.SortKey.CompareTo(currentTime) >= 0) continue; if (hint.DetermineExpiration(_context)) { selectedKeys.Add(em.Key); if (cleanSize > 0 && selectedKeys.Count == cleanSize) break; } } } } if (NCacheLog.IsInfoEnabled) NCacheLog.Info("ExpirationManager.Expire()", String.Format("Expiry time for {0}/{1} Items: " + (DateTime.UtcNow - startTime), selectedKeys.Count, /*_expiryIndex.KeyCount*/cache.Count)); } catch (Exception e) { NCacheLog.Error("ExpirationManager.Expire(bool)", "LocalCache(Expire): " + e.ToString()); } finally { _context.PerfStatsColl.IncrementCacheLastAccessCountStats(oldItemsCount); ApplyLoggs(); ClusteredArrayList dependentItems = new ClusteredArrayList(); DateTime startTime = DateTime.Now; HashVector expiredItemTable = new HashVector(); expiredItemTable.Add(ItemRemoveReason.Expired, selectedKeys);//Time based expiration try { IDictionaryEnumerator ide = expiredItemTable.GetEnumerator(); while (ide.MoveNext()) { selectedKeys = ide.Value as ClusteredArrayList; ItemRemoveReason removedReason = (ItemRemoveReason)ide.Key; if (selectedKeys.Count > 0) { //new architectural changes begins from here. ClusteredArrayList keysTobeRemoved = new ClusteredArrayList(); for (int i = 0; i < selectedKeys.Count && !_cacheCleared; i++) { keysTobeRemoved.Add(selectedKeys[i]); if (keysTobeRemoved.Count % _removeThreshhold == 0) { try { if (this.IsDisposed) break; OperationContext operationContext = new OperationContext(OperationContextFieldName.OperationType, OperationContextOperationType.CacheOperation); object[][] keysExposed = keysTobeRemoved.ToInternalArray(); foreach (object[] collection in keysExposed) { cache.RemoveSync(collection, removedReason, false, operationContext); } //set the flag that item has expired from cache... expired = true; if (_context.PerfStatsColl != null) _context.PerfStatsColl.IncrementExpiryPerSecStatsBy(keysTobeRemoved.Count); } catch (Exception e) { NCacheLog.Error("ExpiryManager.Expire", "an error occurred while removing expired items. Error " + e.ToString()); } keysTobeRemoved.Clear(); //we stop the activity of the current thread so that normal user operation is not affected. Thread.Sleep(_sleepInterval); } } if (!this.IsDisposed && keysTobeRemoved.Count > 0) { try { OperationContext operationContext = new OperationContext(OperationContextFieldName.OperationType, OperationContextOperationType.CacheOperation); object[][] keysExposed = keysTobeRemoved.ToInternalArray(); foreach (object[] keyCollection in keysExposed) { cache.RemoveSync(keyCollection, removedReason, false, operationContext); } //set the flag that item has expired from cache... expired = true; if (_context.PerfStatsColl != null) _context.PerfStatsColl.IncrementExpiryPerSecStatsBy(keysTobeRemoved.Count); } catch (Exception e) { NCacheLog.Error("ExpiryManager.Expire", "an error occurred while removing expired items. Error " + e.ToString()); } } } } } finally { _transitoryIndex.Clear(); lock (this) { _cacheCleared = false; } if (oldeItems != null) { StringBuilder sb = new StringBuilder(); IDictionaryEnumerator ide = oldeItems.GetEnumerator(); int count = 1; while (ide.MoveNext()) { sb.Append(ide.Key + ", "); if (count % 10 == 0) { sb.Append("\r\n"); count = 1; } else count++; } NCacheLog.Info(sb.ToString().Trim()); } } } return expired; }